Power split transmission

Active Publication Date: 2015-03-12
VOLTRA OY AB
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Benefits of technology

[0016]When the secondary power branch is a hydrostatic continuously variable drive connection comprising a variable displacement pump and fixed displacement motor, a fully hydrostatic transmission stage may be provided wherein the (first) main torque transfer path bypasses the epicyclic module and both clutches of the power shuttle module. In this case, the ratio is varied by adjusting the angle of the pump swashplate, for example, between a maximum positive angle (forward) and a maximum negative angle (reverse). The act of shifting transmission stage from fully hyd

Problems solved by technology

Furthermore, the simple construction of the gear trains required to p

Method used

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[0021]The present invention is susceptible of embodiments of many different forms. While the drawings illustrate, and the specification describes, certain preferred embodiments of the invention, it is to be understood that such disclosure is by way of example only. There is no intent to limit the principles of the present invention to the particular disclosed embodiments.

[0022]With reference to FIG. 1, an agricultural tractor transmission 10 is shown diagrammatically. The transmission 10 includes a forward-reverse transmission module 12, and epicyclic module 14, a hydrostatic drive branch 16 and a direct shift transmission (DSG) module 18. The inter-relationship between these components will be described in the following passages. At its input end, transmission 10 is coupled to an internal combustion engine 20 which generates torque via a driveshaft 22 which is transferred via transmission 10 to a differential gearing 24. The invention is not limited to vehicles with internal combus...

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Abstract

A power-split transmission for a vehicle comprises a forward-reverse transmission module, an epicyclic module and a secondary power branch. The forward-reverse power shuttle module (12) comprises an input shaft (22) coupled to a primary motor (20) and an output shaft (38). Also included, first and second clutches (30,48) are alternatively engageable to close respective forward and reverse drive paths between the input shaft and output shaft. Engagement of the first clutch couples the input shaft directly to the output shaft. Engagement of the second clutch couples the input shaft to the output shaft via first and second gear sets (32, 34, 36, 42, 44) which each comprise a plurality of meshed gears. One of the gear sets (32, 34, 36) comprises an odd number of gears and the other gear set (42, 44) comprises an even number of gears. The epicyclic module comprises a first epicyclic input connected to the output shaft of the forward-reverse transmission module, a second epicyclic input connected to an output side of the secondary power branch, and an epicyclic output. The secondary power branch derives power from the primary motor via the first gear set.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]The invention relates to a power-split transmission having a forward-reverse transmission module, an epicyclic module and a secondary power branch for application within a vehicle transmission and which forward-reverse transmission module serves to selectively reverse the direction of torque transfer between an input shaft and an output shaft.[0003]2. Description of Related Art[0004]Vehicle transmissions typically include a gearing arrangement which allows the vehicle to move in reverse. In automobiles, the reverse gear is traditionally a dedicated gear element included in a main gearbox. The same applies to older agricultural tractors. More modern tractors, however, often include a power shuttle unit (or module) which allows all forward gears in the main gearbox to be used also in reverse. International application publication WO-2008 / 142524 discloses a transmission for an agricultural tractor which includes an example pow...

Claims

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Application Information

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IPC IPC(8): F16H37/06F16H3/72F16H61/04F16H47/04
CPCF16H37/06F16H61/0403F16H3/728F16H47/04F16H2037/0886
Inventor RINTOO, MIKKO
Owner VOLTRA OY AB
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